It would appear from the present results that high filipin production cannot be attributed to any specific aliphatic substance, but rather that there are a limited number of compounds which are favorable. It is difficult to decide from the data what the exact requirements in a substrate are, since related materials such as stearic and 12-hydroxystearic acids show such wide differences. It may be necessary to separate toxicity from unavailability. The shorter-chain compounds that are ineffective may be toxic, while the longer-chain ineffective compounds may be unavailable due to inadequate dispersability.

No abstract